In addition to the text walkthrough that was posted online, there's now a complete collection of walkthrough videos up on youtube:
Trick-or-Treat Adventure Quest Video Walkthrough: Part 1
http://www.youtube.com/watch?v=-JE9XQ2ttn0
Trick-or-Treat Adventure Quest Video Walkthrough: Part 2
http://www.youtube.com/watch?v=0GGSxWb7u1g
Trick-or-Treat Adventure Quest Video Walkthrough: Part 3
http://www.youtube.com/watch?v=-NvV0KN00yc
Trick-or-Treat Adventure Quest Video Walkthrough: Part 4
http://www.youtube.com/watch?v=J4c5UtgD7Wg
Trick-or-Treat Adventure Quest Video Walkthrough: Part 5 (
SPOILER WARNING: contains the ending of the game, without sound)
http://www.youtube.com/watch?v=Ymikhjy0A8Q